[plt-scheme] 2htdp/image questions

From: Todd O'Bryan (toddobryan at gmail.com)
Date: Sun Apr 18 16:33:50 EDT 2010

On Sun, Apr 18, 2010 at 9:07 AM, Robby Findler
<robby at eecs.northwestern.edu> wrote:
> As it turns out, That is a bad idea for performance reasons (computing
> the bitmap is far more expensive than any of the other things that get
> done to images) but image equality has to do that (in the fallback
> slow path), so it would not be too hard to add a get-pixel function
> that first computed the image and the returned the pixel.

For personal curiosity's sake, do you have to compute the bitmap to
display the image within DrScheme, or does the translation actually
happen in the video driver or somewhere else deep in the bowels of the


Posted on the users mailing list.